EP0317467B1 - Plugable assembly for printed circuit cards - Google Patents

Plugable assembly for printed circuit cards Download PDF

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Publication number
EP0317467B1
EP0317467B1 EP88480034A EP88480034A EP0317467B1 EP 0317467 B1 EP0317467 B1 EP 0317467B1 EP 88480034 A EP88480034 A EP 88480034A EP 88480034 A EP88480034 A EP 88480034A EP 0317467 B1 EP0317467 B1 EP 0317467B1
Authority
EP
European Patent Office
Prior art keywords
enclosure
plugable
housing
backplane
connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88480034A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0317467A2 (en
EP0317467A3 (en
Inventor
William Dale Corfits
Claude Joseph Mosley
Jerry Richard Rasmussen
Stephen Edward Wheeler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0317467A2 publication Critical patent/EP0317467A2/en
Publication of EP0317467A3 publication Critical patent/EP0317467A3/en
Application granted granted Critical
Publication of EP0317467B1 publication Critical patent/EP0317467B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0062—Structures of standardised dimensions, e.g. 19" rack, chassis for servers or telecommunications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1461—Slidable card holders; Card stiffeners; Control or display means therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00—Electricity: conductors and insulators
    • Y10S174/34—PCB in box or housing

Definitions

  • This invention relates generally to a shielded, plugable, mounting enclosure for printed circuit cards such as used in a computer.
  • Improvements in semiconductor technology have contributed to a manyfold increase in the number of electronic devices used in everyday life.
  • the reduced size and cost of transistors and integrated circuits have made many electronic devices virtual necessities to every day life.
  • the expansion of electronic devices has occurred in the work place as well as the home, bringing people with virtually no electronic experience or skills into contact as purchasers and users.
  • DE-A-3 604 860 describes an arrangement for electromagnetically shielding a plurality of pluggable electric elements, each of which comprises a grounding spring for engaging the inner surface of the enclosure.
  • EP-A-188 968 describes a write/read device comprising several pluggable electronic memory modules comprising a locking mechanism.
  • the principal object of the invention is to provide a shielded enclosure assembly as defined in claim 1.
  • This invention provides a package for large and small printed circuit cards, easily handled and plugged by the unskilled user, which provides a very high degree of electromagnetic shielding
  • the package includes a book-like housing, which can totally enclose and shield a circuit card, adapted to be plugged into a host assembly such as a computer backplane.
  • the housing is easily adapted to polarization to prevent individual housings from being plugged into inappropriate slots in the backplane.
  • the housing may include camming handles which serve to force the housing into the receiving socket, hold the housing in place after plugging, and serve to cam the housing out of the socket when the housing is to be removed.
  • the housing has accommodation for the flow of cooling air over the enclosed circuit card to prevent overheating.
  • Fig. 1 is a partial isometric view of a portion of an assembly showing a plugable printed circuit card enclosure according to the invention.
  • Fig. 1a is a partial front view of the right rear corner of the system backplane showing the arrangement of the connector and grounding springs.
  • Fig. 1b is a sectional view of a grounding spring shown in Fig. 1a taken along the line 1b-1b.
  • Fig. 2 is an isometric view of a plugable printed circuit card enclosure according to the invention.
  • Fig. 3 is an isometric view of a plugable printed circuit card enclosure according to the invention wherein multiple cards may be serially plugged into the enclosure.
  • Fig. 4 is an isometric view of a plugable printed circuit card enclosure according to the invention wherein multiple cards may be adjacently plugged into the enclosure.
  • Fig. 5 is an isometric view of a plugable printed circuit card enclosure according to the invention wherein multiple cards may be plugged into the enclosure and held in position with a lever type latch which assists in the plugging and unplugging operation.
  • Fig. 6 is an isometric view of a plugable printed circuit card enclosure according to the invention wherein multiple cards may be plugged into the enclosure for the accommodation of plugable printed circuit card enclosures shown in Fig. 5.
  • Fig. 7 is an exploded view of a smaller puggable printed circuit card enclosure showing the arrangement of the printed circuit card and an identifying label.
  • a computer backplane assembly comprises an enclosure 1 having a plurality of positions for card enclosures separated by guide rails 2. Cooling air holes 3 are located on the top surface 5 and the bottom surface 6. The rear of the enclosure 1 includes a plurality of connectors and grounding springs as shown in Fig. 1a.
  • a connector 11 is positioned to accept a complementary connector 21 on a plugable card assembly 20.
  • a plurality of grounding springs 12 are positioned around the connector to provide shielding.
  • the shape of grounding springs 12 is shown in Fig. 1b, which is a partial sectional view taken along the line 1b-1b of Fig. 1a.
  • Each of the grounding springs 12 has a curved portion 13 which is deflected backwardly toward rear wall 14 by the rear surface of the plugable enclosure.
  • the grounding springs 12 are fastened to the rear wall 14 by appropriate fasteners such as screws 15 which pass through the flat portion 16.
  • Plugable card assembly 20 is adapted to fit between the guide rails 2. If it is desired to restrict the plugable card assembly 20 to a single plug position, suitable keys can be provided on the enclosure 1 to prevent misplugging. For example, an enlarged corner key 25, which is adapted to fit a plugable card assembly having the upper left corner recessed to fit the corner key 25, can be provided to prevent plugging of assemblies which lack the correct key.
  • the plugable card assembly 20 includes a back, or first end, 30 on which the complementary connector 21 is mounted.
  • the back end 30 is essentially flat to provide a good grounding surface for grounding springs 12.
  • the top 31 of the enclosure contains a plurality of openings 32 to accommodate the flow of cooling air.
  • the bottom 35 contains a plurality of openings 36 to accommodate the flow of cooling air.
  • Suitable means such as a fan, may be used to force cooling air through the cooling air holes 3, the plugable card assembly 20 and out the openings 36.
  • a grounding spring 37 is positioned on the top of plugable card assembly 20 for engaging the inner surface of the enclosure 1, and providing an improved connection to ground for shielding purposes.
  • a printed circuit card 84 having connections to complementary connector 21, is mounted within plugable card assembly 20.
  • the embodiment shown in Fig. 1 is illustrative of an embodiment in which the circuit card occupies only a portion of the plugable card assembly 20. Alternatively, the circuit card can occupy the entire enclosure, in which case the open front portion 38 would be replaced with a solid face as will be later described.
  • a pair of handles 40 and 41 are pivotally mounted on bosses supported by projections 43 extending from the sides of plugable card assembly 20. These handles may be used to disengage the enclosure from the backplane by forcing handle 40 upwardly and handle 41 downwardly. The shorter portions 45 and 46 are thus brought to bear against the abutting front surface of the enclosure 1 and serve to cam the enclosure for disengagement with the enclosure 1.
  • a smaller, plugable "daughter" printed circuit card enclosure 60 is adapted to fit with the plugable card assembly 20 and make contact with the connector 61, mounted on partition 64 by means of a complementary connector, not shown, on the rear of the assembly.
  • Enclosure 60 has holes 63 in the top surface 62, which coact with the openings 32 to provide a flow of cooling air over the electronic circuitry within the enclosure.
  • the bottom surface of enclosure 60 also contains holes, not shown, for the passage of cooling air.
  • a handle 65 pivoted at points 66 and 67, has a pair of ears 70 and 71 which coact with the slots 72 and 73 in the sides of plugable card assembly 20.
  • the enclosure 60 is pushed inwardly until the ends of ears 70 and 71 come to bear against the back edge of slots 72 and 73. At this point the finger tab 74 is moved upwardly, causing the ears 70 and 71 to bear against the inner edges 80 and 81 of slots 72 and 73. Continued movement of finger tab 74 in the clockwise direction causes the pivot points 66 and 67 to cam against the inner edges 80 and 81 and force the connector of enclosure 60 into engagement with connector 61.
  • the locking ears 90 and 91 engage the catches 92 and 93 to hold the handle in the closed position and hold enclosure 60 in position with plugable card assembly 20.
  • the portion of the handle to which the locking ears 90 and 91 are attached is sufficiently flexible to allow the locking ears 90 and 91 to deflect inwardly, passing beyond the catches 92 and 93 to be retained thereby. This flexibility allows the catches to be deflected inwardly for disengagement of the ears from the catches during the unplugging operation.
  • the handle 65 is moved counterclockwise, causing the ears 70 and 71 to cam against the slot surfaces 95 and 96, to eject the enclosure from the plugged position.
  • the handle serves three purposes, it cams the enclosure 60 into engagement with the plugable card assembly 20; it locks the enclosure 60 in the plugged position within plugable card assembly 20; and it ejects the enclosure 60 from within the plugable card assembly 20.
  • the simplicity of this operation provides a simple to understand and virtually foolproof plugging and unplugging process.
  • a small rectangular key 98 which may also serve as a guide rail, is positioned within plugable card assembly 20 at the lower right hand of the opening for the enclosure 60.
  • a complementary rectangular slot 99 exists in the lower right hand portion of the enclosure 60. An enclosure lacking the appropriate rectangular slot 99 is thus prevented from being plugged into this slot. If desired, other key arrangements can be added to provide a unique slot for each plugable enclosure.
  • the apertures for the flow of air will be of generally small dimension, preferably having a maximum dimension of less than 2,54 cm (one inch) to reduce emissions in the shorter wavelengths.
  • the region surrounding the plug at the rear of enclosure 60 is relatively flat, thereby proving good contact with the plurality of springs 97, positioned about the connector 61.
  • Fig. 2 shows an alternative form of enclosure for plugging into the enclosure 1.
  • the printed circuit card enclosure 200 is proportioned to accommodate a larger card than the enclosure 60 previously described. Typical of such a larger card would be the card containing the processor circuitry or basis increment of memory for a small computer.
  • the enclosure 200 contains no accommodation for the plugging of additional enclosures and therefore has a solid cover throughout.
  • the enclosure 200 would be plugged into a slot similar to the slot which receives the plugable card assembly 20.
  • the enclosure 200 has a grounding spring 237 on the top for coaction with the inner portion of the top of backplane assembly 1.
  • Enclosure 200 also has handles 240 and 241 which serve the same purpose as the comparable elements of plugable card assembly 20.
  • the shape of the holes 232 in the top 231 of enclosure 200 is somewhat different than the shape of the openings 32 in the plugable card assembly 20.
  • the smaller, thinner holes may be desired when the circuitry contained within the enclosure is more sensitive to interference or has a greater tendency to emit radiation in an undesired spectrum.
  • Fig. 3 is illustrative of another embodiment of the plugable enclosure. It is desirable in some circumstances to provide a "piggyback" arrangement for optional printed circuit cards when those added later must rely on certain circuit features in earlier added cards, or where a plurality of cards share a common bus, such as memory cards.
  • the basic enclosure 300 occupies the full depth of the enclosure 1. It has the same type of holes 332 in the top for air flow and the same type of handles 340 and 341 for extraction of the enclosure from the backplane.
  • the front of the enclosure 300 has an opening of sufficient width to accommodate the insertion of the smaller plugable assemblies 320 and 330, each of which may have a suitable connector 321 and a connector on the back of enclosure 320 which is not shown.
  • a slot 350 in the side of enclosure 300 has a pair of holes 351 and 352 at the extremities.
  • the holes are slightly larger than the corresponding buttons 371 and 381 on enclosures 320 and 330, respectively.
  • Each of the buttons is mounted on a flexible tab portion of the side of the smaller enclosure.
  • Tab portion 372 of enclosure 320 allows the button 371, and its counterpart on the opposite side of enclosure 320, to be deflected inwardly to allow the enclosure 320 to be inserted into the open end of the enclosure 300.
  • the smaller enclosure is pushed into the larger until the connector, not shown, mates with the connector, not shown, on the inside of enclosure 300.
  • button 371 lines up with slot 351 and pops out into slot 351 to retain the enclosure 320 in place. It will be appreciated that the button 371 will first pop out into the hole 352 and must be again deflected inwardly to allow completion of the insertion process.
  • the enclosure 330 may then be inserted into enclosure 300 in like fashion, locking into place when the button 381, on tab 382, pops out into hole 352.
  • Removal of the piggyback enclosures is accomplished by depressing the buttons inwardly to disengage them from the holes and urging the enclosure outwardly.
  • the additional holes 353 and 354 are positioned to accommodate three piggyback enclosures having one third the length of those shown. Each one of the enclosures would then latch into one of the holes 352, 353, and 354.
  • FIG. 4 A further alternative embodiment of plugable enclosure is shown in Fig. 4.
  • the top 431 of enclosure 400 has a plurality of air holes 432.
  • Latches 440 and 441 provide the same function as previously described.
  • a grounding spring 437 functions in the same manner as that for the earlier described embodiments.
  • the enclosure 400 is designed to accommodate the plugging of three smaller enclosures 470, 480 and 490.
  • Each of these smaller enclosures has the same sort of locking buttons 471, 481 and 491 as that described with reference to the embodiment of Fig. 3.
  • the locking buttons are mounted on flexible tongues 472, 482 and 492, respectively, to allow them to be deflected inwardly during the process of insertion into enclosure 400.
  • the front of enclosure 400 has three cut-out portions 401, 402 and 403 to provide an area where the fingers can easily grasp the enclosure 470, 480 and 490 during the insertion and removal process.
  • the holes 453, 452 and 454 coact with the buttons 471, 481 and 491 to lock the smaller enclosures in place.
  • one of the enclosures may have a socket 460 for the connection of a cable leading to a printer or other peripheral device.
  • guide rails 410 and 411 are located with the enclosure 400 to accurately position the individual smaller enclosures as they slid into place.
  • Fig. 5 shows a larger plugable enclosure 500 with one smaller enclosure 520 in position for insertion and one smaller enclosure 530 in the plugged position, illustrating the manner in which the handle 565 locks the enclosure in the plugged position.
  • the embodiment of Fig. 6 is similar to that of Figs. 4 and 5.
  • the larger plugable enclosure 600 includes a provision for insertion of a variety of smaller plugable enclosures 620, 630, and 640, each of which has a corresponding slot 621, 631, and 641 in the side walls of enclosure 600 for the locking handles 623, 633 and 643, respectively.
  • the connector 626 is plugged into socket 627 after insertion of the enclosure 620 into enclosure 600 and after handle 623 is locked in place as described with reference to Fig. 1. This locks enclosure 620 in place and it cannot be removed without first removing connector 626 from socket 627. This is desirable because of the adverse effect on system operation caused by the inadvertent disconnection of an I/O module such as contained in enclosure 620 during operation of a system.
  • the error condition caused by such disconnection is one from which a typical computer system has a difficult time recovering, and it is therefore desirable to avoid.
  • Fig. 7 is an exploded view of a smaller plugable enclosure such as enclosure 520 shown in Fig. 5.
  • This enclosure is suitable for holding a printed circuit card for the implantation of a feature which may be optional. That is, a standard minimum computer configuration might not require inclusion of the feature contained in this enclosure.
  • the enclosure includes a left side 710, a right side 720, and a printed circuit card 730 mounted in the front 740.
  • the circuit card 730 is spaced from side 710 by molding projections 711 and 712.
  • a plurality of holes 731 connected to handles, not shown, on the circuit board 730 accommodate the lead wires to a connector mounted on the back of the enclosure.
  • the handle 750 is pivotally mounted on bosses 751 extending from the ears 752. Holes for cooling air are provided by the opposing interlocking fingers 723 and 713 on sides 720 and 710, respectively.
  • a label 760 may be affixed to the side 720 for identification purposes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mounting Of Printed Circuit Boards And The Like (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP88480034A 1987-11-17 1988-09-13 Plugable assembly for printed circuit cards Expired - Lifetime EP0317467B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US121436 1980-02-14
US07/121,436 US4821145A (en) 1987-11-17 1987-11-17 Pluggable assembly for printed circuit cards

Publications (3)

Publication Number Publication Date
EP0317467A2 EP0317467A2 (en) 1989-05-24
EP0317467A3 EP0317467A3 (en) 1990-01-03
EP0317467B1 true EP0317467B1 (en) 1992-12-09

Family

ID=22396721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88480034A Expired - Lifetime EP0317467B1 (en) 1987-11-17 1988-09-13 Plugable assembly for printed circuit cards

Country Status (14)

Country Link
US (1) US4821145A (zh)
EP (1) EP0317467B1 (zh)
JP (1) JPH07109948B2 (zh)
KR (1) KR910007513Y1 (zh)
CN (1) CN1010166B (zh)
AR (1) AR243311A1 (zh)
BR (1) BR8805985A (zh)
CA (1) CA1283739C (zh)
DE (1) DE3876604T2 (zh)
ES (1) ES2036710T3 (zh)
GB (1) GB8814631D0 (zh)
HK (1) HK140493A (zh)
MY (1) MY103452A (zh)
PH (1) PH24352A (zh)

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Also Published As

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JPH01143397A (ja) 1989-06-05
US4821145A (en) 1989-04-11
MY103452A (en) 1993-06-30
CN1035600A (zh) 1989-09-13
GB8814631D0 (en) 1988-07-27
EP0317467A2 (en) 1989-05-24
DE3876604D1 (de) 1993-01-21
CA1283739C (en) 1991-04-30
JPH07109948B2 (ja) 1995-11-22
AR243311A1 (es) 1993-07-30
ES2036710T3 (es) 1993-06-01
DE3876604T2 (de) 1993-06-03
CN1010166B (zh) 1990-10-24
BR8805985A (pt) 1989-08-08
KR910007513Y1 (ko) 1991-09-27
KR890011367U (ko) 1989-07-13
EP0317467A3 (en) 1990-01-03
PH24352A (en) 1990-06-13
HK140493A (en) 1993-12-31

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